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| author | Maciej S. Szmigiero <mail@maciej.szmigiero.name> | 2017-11-20 23:16:07 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2017-11-27 16:43:43 +0000 |
| commit | b880b8056b31288323745a13930bc45cf4c86e9d (patch) | |
| tree | f249f5077bd7d905f0d837a7916a499d8fe38def /arch/riscv/kernel/vdso/clock_gettime.S | |
| parent | 695b78b548d8a26288f041e907ff17758df9e1d5 (diff) | |
ASoC: fsl_ssi: serialize AC'97 register access operations
AC'97 register access operations (both read and write) on SSI use a one,
shared set of SSI registers for AC'97 register address and data.
This means that only one such access is possible at a time and so all these
operations need to be serialized.
Since an AC'97 register access operation in this driver takes 100us+ let's
use a mutex for this.
Use this opportunity to also change a default value returned from AC'97
register read function from -1 to 0, since that's what AC'97 specs require
to be returned when unknown / undefined registers are read.
Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'arch/riscv/kernel/vdso/clock_gettime.S')
0 files changed, 0 insertions, 0 deletions